measure.php

<?php

$arr = [];

$loopTime = now();
$counter = 0;

foreach ($arr as $i) {
  if ($counter % 10 === 0) {
      Log::driver('service')->info('EMPL', [
          'cnt' => $counter,
          'p/m' => 60_000_000 / (now()->diffInMicroseconds($loopTime) / 10),
      ]);
      $loopTime = now();
  }

  $counter++;
}